asinh, acosh, atanh - inverse hyperbolic functions
double asinh(double x);
double acosh(double x);
double atanh(double x);
These functions compute the designated inverse hyperbolic functions for
ERROR (due to Roundoff etc.) [Toc] [Back]
These functions inherit much of their error from log1p described in
In the diagnostics below, functions in the standard math library libm.a,
are referred to as -lm versions, those in math library libmx.a are
referred to as -lmx versions, and those in the the BSD math library
libm43.a are referred to as -lm43 versions. The -lm and -lmx versions
always return the default Quiet NaN and set errno to EDOM when a NaN is
used as an argument. A NaN argument usually causes the -lm43 versions to
return the same argument. The -lm43 versions never set errno.
acosh returns the default quiet NaN if the argument is less than 1. The
-lm and -lmx versions also set errno to EDOM.
atanh returns the default quiet NaN if the argument has absolute value
greater than 1. The -lm and -lmx versions also set errno to EDOM.
See matherr(3M) for a description of error handling for -lmx functions.
math(3M), exp(3M), matherr(3M)
PPPPaaaaggggeeee 1111 [ Back ]